Dating techniques east america

With the development of puddling and transplanting, rice became truly domesticated.

Movement to western India and south to Sri Lanka was also accomplished very early.

Puddling the soil – turning it to mud to break it down and prevent too much water percolating away – and transplanting seedlings were likely refined in China.

Recent genetic evidence show that all forms of Asian rice, both indica and japonica, come from a single domestication event that occurred 8,200–13,500 years ago in the Pearl River valley region of China.

In China, extensive archeological evidence points to the middle Yangtze and upper Huai rivers as the two earliest places of cultivation in the country.

In 2003, Korean archaeologists claimed to have discovered the world's oldest domesticated rice.

Their 15,000 year old age challenges the accepted view that rice cultivation originated in China about 12,000 years ago.

These findings were received by academia with strong skepticism, and the results and their publicizing has been cited as being driven by a combination of nationalist and regional interests.

In 2011, a combined effort by the Stanford University, New York University, Washington University in St.Asian farmers still account for 92% of the world's total rice production. Between 1500 and 800 BC, propagated from its original centre, the Niger River delta, and extended to Senegal.However, it never developed far from its original region.was recovered from a grave at Susa in Iran (dated to the 1st century AD) at one end of the ancient world, another domestication of rice in South Asia.Today, the majority of all rice produced comes from China, India, Indonesia, Pakistan, Bangladesh, Vietnam, Thailand, Myanmar, Philippines, and Japan.The first record for North America dates from 1685, when the crop was produced on the coastal lowlands and islands of what is now South Carolina.